[R] standard errors for predict.nls?

Ben Bolker bolker at ufl.edu
Mon Nov 3 15:48:16 CET 2008

Christoph Scherber <Christoph.Scherber <at> agr.uni-goettingen.de> writes:

> Dear all,
> Is there a way to retrieve standard errors from nls models? 
> The help page tells me that arguments 
> such as se.fit are ignored...
> Many thanks and best wishes
> Christoph

  I have written some reasonably generic
delta-function code that can in principle
do this.  I have been thinking about contributing it, if R-core
thinks it's worthwhile, but I haven't gotten around to incorporating
it into a version of predict.nls yet.  In the meantime, if you
install the emdbook package and look at ?deltavar, you may
be able to get that to work for you ... (if not, get back in
touch & I'll try to help -- maybe this will be the impetus
to develop that code a bit more).

    Ben Bolker

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